[Samba] Computer in Samba 4.3.11 domain - logon server unavailable
Lorenzo Milesi
maxxer at yetopen.it
Thu Mar 19 17:37:29 UTC 2020
We've a Samba 4 domain (no AD, just DC) with LDAP backend on Ubuntu 14.04. This server has been migrated from files backend to LDAP by the previous maintainer, I know the version is pretty old but we cannot update at the moment.
The domain works fine with some W7 and W10 (updated from 7) computers, but we have purchased a new Lenovo laptop with Win10 which joined the domain seamlessly but denies any login with a domain user, it always returns:
we can't sign you in with this credential because your domain isn't available.
After digging into event manager I found the error:
RPC Server unavailable (id 5719)
Samba is listening on ports 445 and 139, RPC should be on 135 if I got it right, but I have other Samba4 DC setup without port 135 open, and they work fine. This one as well has other Win10 PCs logging in correctly (tough they were W7 before, the failing one is brand new).
We tried enabling SMBv1, changing computer name, removing and adding it back to the domain, none of these actions produced a change. We also tried the three common actions suggested for this kind of error (changing dns, remove credentials caching, remove protected user (tough having no one)) and none of these worked.
I raised Samba log level but it won't report anything useful. We've just seen the IP successfully connecting to port 445, but nothing else.
Could it be a SID problem?
Another error I found in event log is:
NETLOGON 5719: Unable to establish secure connection to a domain controller.
I checked with
nltest /DSGET:DOM
nltest /DNSGET:DOM
and the first return all the domain information, the latter just report "Command executed correctly".
smb.conf:
[global]
name resolve order = lmhosts hosts bcast
force group = adm
pam password change = yes
browsable = yes
server signing = auto
winbind uid = 10000-20000
remote announce = 10.0.0.255/OFFICE
interfaces = 10.0.0.3/24 127.0.0.1
bind interfaces only = yes
guest account = nobody
guest ok = yes
netbios name = server3
printing = bsd
delete readonly = yes
writeable = yes
logon script = netlogon.bat
local master = yes
workgroup = office
os level = 255
printcap name = /dev/null
security = user
username map = /etc/samba/username.map
max log size = 50
directory mode = 2770
log level = 10
log file = /var/log/samba/log.%m
load printers = no
root directory = /
force directory mode = 2777
logon drive = H:
domain master = yes
domain logons = yes
encrypt passwords = yes
winbind use default domain = Yes
server string = server3
winbind enum users = yes
unix password sync = yes
force create mode = 0777
winbind enum groups = yes
create mode = 0770
prefered master = yes
winbind cache time = 10
server signing = auto
ntlm auth = yes
lanman auth = yes
server signing = auto
map untrusted to domain = Yes
# wins support = yes
allow dcerpc auth level connect = yes
ldap suffix = dc=office,dc=lan
ldap user suffix = ou=Users
ldap machine suffix = ou=Computers
ldap group suffix = ou=Groups
ldap idmap suffix = ou=Idmap
ldap admin dn = cn=admin,dc=office,dc=lan
passdb backend = ldapsam:ldap://localhost:3890/
name resolve order = wins host dns bcast
add user script = /bin/netuseradd -a -m '%u'
delete user script = /bin/netuserdel '%u'
add group script = /bin/netgroupadd -a -p '%g'
delete group script = /bin/netgroupdel '%g'
add user to group script = /bin/netgroupmod -m '%u' '%g'
delete user from group script = /bin/netgroupmod -x '%u' '%g'
set primary group script = /bin/netusermod -g '%g' '%u'
add machine script = /bin/netuseradd -w '%u'
logon script = %U.bat
logon path =
logon home =
ldap ssl = no
wins support = yes
Debug log:
[2020/03/19 18:07:33.656027, 5, pid=27931, effective(0, 0), real(0, 0)] ../lib/dbwrap/dbwrap.c:178(dbwrap_check_lock_order)
check lock order 1 for /var/run/samba/smbXsrv_session_global.tdb
[2020/03/19 18:07:33.656041, 10, pid=27931, effective(0, 0), real(0, 0)] ../lib/dbwrap/dbwrap.c:133(debug_lock_order)
lock order: 1:/var/run/samba/smbXsrv_session_global.tdb 2:<none> 3:<none>
[2020/03/19 18:07:33.656056, 10, pid=27931, effective(0, 0), real(0, 0)] ../lib/dbwrap/dbwrap_tdb.c:59(db_tdb_log_key)
Locking key B266FEC4
[2020/03/19 18:07:33.656074, 10, pid=27931, effective(0, 0), real(0, 0)] ../lib/dbwrap/dbwrap_tdb.c:143(db_tdb_fetch_locked_internal)
Allocated locked data 0x0x7f114a7f3d70
[2020/03/19 18:07:33.656374, 10, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/smbXsrv_session.c:888(smbXsrv_session_global_store)
[2020/03/19 18:07:33.656384, 10, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/smbXsrv_session.c:890(smbXsrv_session_global_store)
smbXsrv_session_global_store: key 'B266FEC4' stored
[2020/03/19 18:07:33.656399, 1, pid=27931, effective(0, 0), real(0, 0)] ../librpc/ndr/ndr.c:402(ndr_print_debug)
&global_blob: struct smbXsrv_session_globalB
version : SMBXSRV_VERSION_0 (0)
seqnum : 0x00000002 (2)
info : union smbXsrv_session_globalU(case 0)
info0 : *
info0: struct smbXsrv_session_global0
db_rec : *
session_global_id : 0xb266fec4 (2993094340)
session_wire_id : 0x00000000b266fec4 (2993094340)
creation_time : Thu Mar 19 18:07:34 2020 CET
expiration_time : Thu Jan 1 01:00:00 1970 CET
auth_time : Thu Mar 19 18:07:34 2020 CET
auth_session_info_seqnum : 0x00000001 (1)
auth_session_info : *
auth_session_info: struct auth_session_info
security_token : *
security_token: struct security_token
num_sids : 0x00000008 (8)
sids: ARRAY(8)
sids : S-1-5-21-1476696432-437498857-2255427411-501
sids : S-1-5-21-1476696432-437498857-2255427411-514
sids : S-1-22-2-65534
sids : S-1-1-0
sids : S-1-5-2
sids : S-1-5-32-546
sids : S-1-22-1-65534
sids : S-1-22-2-514
privilege_mask : 0x0000000000000000 (0)
0: SEC_PRIV_MACHINE_ACCOUNT_BIT
0: SEC_PRIV_PRINT_OPERATOR_BIT
0: SEC_PRIV_ADD_USERS_BIT
0: SEC_PRIV_DISK_OPERATOR_BIT
0: SEC_PRIV_REMOTE_SHUTDOWN_BIT
0: SEC_PRIV_BACKUP_BIT
0: SEC_PRIV_RESTORE_BIT
0: SEC_PRIV_TAKE_OWNERSHIP_BIT
0: SEC_PRIV_INCREASE_QUOTA_BIT
0: SEC_PRIV_SECURITY_BIT
0: SEC_PRIV_LOAD_DRIVER_BIT
0: SEC_PRIV_SYSTEM_PROFILE_BIT
0: SEC_PRIV_SYSTEMTIME_BIT
0: SEC_PRIV_PROFILE_SINGLE_PROCESS_BIT
0: SEC_PRIV_INCREASE_BASE_PRIORITY_BIT
0: SEC_PRIV_CREATE_PAGEFILE_BIT
0: SEC_PRIV_SHUTDOWN_BIT
0: SEC_PRIV_DEBUG_BIT
0: SEC_PRIV_SYSTEM_ENVIRONMENT_BIT
0: SEC_PRIV_CHANGE_NOTIFY_BIT
0: SEC_PRIV_UNDOCK_BIT
0: SEC_PRIV_ENABLE_DELEGATION_BIT
0: SEC_PRIV_MANAGE_VOLUME_BIT
0: SEC_PRIV_IMPERSONATE_BIT
0: SEC_PRIV_CREATE_GLOBAL_BIT
rights_mask : 0x00000000 (0)
0: LSA_POLICY_MODE_INTERACTIVE
0: LSA_POLICY_MODE_NETWORK
0: LSA_POLICY_MODE_BATCH
0: LSA_POLICY_MODE_SERVICE
0: LSA_POLICY_MODE_PROXY
0: LSA_POLICY_MODE_DENY_INTERACTIVE
0: LSA_POLICY_MODE_DENY_NETWORK
0: LSA_POLICY_MODE_DENY_BATCH
0: LSA_POLICY_MODE_DENY_SERVICE
0: LSA_POLICY_MODE_REMOTE_INTERACTIVE
0: LSA_POLICY_MODE_DENY_REMOTE_INTERACTIVE
0x00: LSA_POLICY_MODE_ALL (0)
0x00: LSA_POLICY_MODE_ALL_NT4 (0)
unix_token : *
unix_token: struct security_unix_token
uid : 0x000000000000fffe (65534)
gid : 0x000000000000fffe (65534)
ngroups : 0x00000002 (2)
groups: ARRAY(2)
groups : 0x0000000000000202 (514)
groups : 0x000000000000fffe (65534)
info : *
info: struct auth_user_info
account_name : *
account_name : 'nobody'
domain_name : *
domain_name : 'DOM'
full_name : NULL
logon_script : NULL
profile_path : NULL
home_directory : NULL
home_drive : NULL
logon_server : NULL
last_logon : NTTIME(0)
last_logoff : NTTIME(0)
acct_expiry : NTTIME(0)
last_password_change : NTTIME(0)
allow_password_change : NTTIME(0)
force_password_change : NTTIME(0)
logon_count : 0x0000 (0)
bad_password_count : 0x0000 (0)
acct_flags : 0x00000000 (0)
authenticated : 0x00 (0)
unix_info : *
unix_info: struct auth_user_info_unix
unix_name : *
unix_name : 'nobody'
sanitized_username : *
sanitized_username : ''
torture : NULL
credentials : NULL
connection_dialect : 0x0311 (785)
signing_required : 0x00 (0)
encryption_required : 0x00 (0)
num_channels : 0x00000001 (1)
channels: ARRAY(1)
channels: struct smbXsrv_channel_global0
server_id: struct server_id
pid : 0x0000000000006d1b (27931)
task_id : 0x00000000 (0)
vnn : 0xffffffff (4294967295)
unique_id : 0x186f91593000f4b8 (1760785791568639160)
local_address : 'ipv4:10.0.0.1:445'
remote_address : 'ipv4:10.0.0.90:56660'
remote_name : '10.0.0.90'
auth_session_info_seqnum : 0x00000001 (1)
connection : *
[2020/03/19 18:07:33.657137, 10, pid=27931, effective(0, 0), real(0, 0)] ../lib/dbwrap/dbwrap_tdb.c:59(db_tdb_log_key)
Unlocking key B266FEC4
[2020/03/19 18:07:33.657155, 5, pid=27931, effective(0, 0), real(0, 0)] ../lib/dbwrap/dbwrap.c:146(dbwrap_lock_order_state_destructor)
release lock order 1 for /var/run/samba/smbXsrv_session_global.tdb
[2020/03/19 18:07:33.657168, 10, pid=27931, effective(0, 0), real(0, 0)] ../lib/dbwrap/dbwrap.c:133(debug_lock_order)
lock order: 1:<none> 2:<none> 3:<none>
[2020/03/19 18:07:33.657182, 10, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/smbXsrv_session.c:1346(smbXsrv_session_update)
[2020/03/19 18:07:33.657191, 10, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/smbXsrv_session.c:1354(smbXsrv_session_update)
smbXsrv_session_update: global_id (0xb266fec4) stored
[2020/03/19 18:07:33.657204, 1, pid=27931, effective(0, 0), real(0, 0)] ../librpc/ndr/ndr.c:402(ndr_print_debug)
&session_blob: struct smbXsrv_sessionB
version : SMBXSRV_VERSION_0 (0)
reserved : 0x00000000 (0)
info : union smbXsrv_sessionU(case 0)
info0 : *
info0: struct smbXsrv_session
table : *
db_rec : NULL
client : *
local_id : 0xb266fec4 (2993094340)
global : *
global: struct smbXsrv_session_global0
db_rec : NULL
session_global_id : 0xb266fec4 (2993094340)
session_wire_id : 0x00000000b266fec4 (2993094340)
creation_time : Thu Mar 19 18:07:34 2020 CET
expiration_time : Thu Jan 1 01:00:00 1970 CET
auth_time : Thu Mar 19 18:07:34 2020 CET
auth_session_info_seqnum : 0x00000001 (1)
auth_session_info : *
auth_session_info: struct auth_session_info
security_token : *
security_token: struct security_token
num_sids : 0x00000008 (8)
sids: ARRAY(8)
sids : S-1-5-21-1476696432-437498857-2255427411-501
sids : S-1-5-21-1476696432-437498857-2255427411-514
sids : S-1-22-2-65534
sids : S-1-1-0
sids : S-1-5-2
sids : S-1-5-32-546
sids : S-1-22-1-65534
sids : S-1-22-2-514
privilege_mask : 0x0000000000000000 (0)
0: SEC_PRIV_MACHINE_ACCOUNT_BIT
0: SEC_PRIV_PRINT_OPERATOR_BIT
0: SEC_PRIV_ADD_USERS_BIT
0: SEC_PRIV_DISK_OPERATOR_BIT
0: SEC_PRIV_REMOTE_SHUTDOWN_BIT
0: SEC_PRIV_BACKUP_BIT
0: SEC_PRIV_RESTORE_BIT
0: SEC_PRIV_TAKE_OWNERSHIP_BIT
0: SEC_PRIV_INCREASE_QUOTA_BIT
0: SEC_PRIV_SECURITY_BIT
0: SEC_PRIV_LOAD_DRIVER_BIT
0: SEC_PRIV_SYSTEM_PROFILE_BIT
0: SEC_PRIV_SYSTEMTIME_BIT
0: SEC_PRIV_PROFILE_SINGLE_PROCESS_BIT
0: SEC_PRIV_INCREASE_BASE_PRIORITY_BIT
0: SEC_PRIV_CREATE_PAGEFILE_BIT
0: SEC_PRIV_SHUTDOWN_BIT
0: SEC_PRIV_DEBUG_BIT
0: SEC_PRIV_SYSTEM_ENVIRONMENT_BIT
0: SEC_PRIV_CHANGE_NOTIFY_BIT
0: SEC_PRIV_UNDOCK_BIT
0: SEC_PRIV_ENABLE_DELEGATION_BIT
0: SEC_PRIV_MANAGE_VOLUME_BIT
0: SEC_PRIV_IMPERSONATE_BIT
0: SEC_PRIV_CREATE_GLOBAL_BIT
rights_mask : 0x00000000 (0)
0: LSA_POLICY_MODE_INTERACTIVE
0: LSA_POLICY_MODE_NETWORK
0: LSA_POLICY_MODE_BATCH
0: LSA_POLICY_MODE_SERVICE
0: LSA_POLICY_MODE_PROXY
0: LSA_POLICY_MODE_DENY_INTERACTIVE
0: LSA_POLICY_MODE_DENY_NETWORK
0: LSA_POLICY_MODE_DENY_BATCH
0: LSA_POLICY_MODE_DENY_SERVICE
0: LSA_POLICY_MODE_REMOTE_INTERACTIVE
0: LSA_POLICY_MODE_DENY_REMOTE_INTERACTIVE
0x00: LSA_POLICY_MODE_ALL (0)
0x00: LSA_POLICY_MODE_ALL_NT4 (0)
unix_token : *
unix_token: struct security_unix_token
uid : 0x000000000000fffe (65534)
gid : 0x000000000000fffe (65534)
ngroups : 0x00000002 (2)
groups: ARRAY(2)
groups : 0x0000000000000202 (514)
groups : 0x000000000000fffe (65534)
info : *
info: struct auth_user_info
account_name : *
account_name : 'nobody'
domain_name : *
domain_name : 'DOM'
full_name : NULL
logon_script : NULL
profile_path : NULL
home_directory : NULL
home_drive : NULL
logon_server : NULL
last_logon : NTTIME(0)
last_logoff : NTTIME(0)
acct_expiry : NTTIME(0)
last_password_change : NTTIME(0)
allow_password_change : NTTIME(0)
force_password_change : NTTIME(0)
logon_count : 0x0000 (0)
bad_password_count : 0x0000 (0)
acct_flags : 0x00000000 (0)
authenticated : 0x00 (0)
unix_info : *
unix_info: struct auth_user_info_unix
unix_name : *
unix_name : 'nobody'
sanitized_username : *
sanitized_username : ''
torture : NULL
credentials : NULL
connection_dialect : 0x0311 (785)
signing_required : 0x00 (0)
encryption_required : 0x00 (0)
num_channels : 0x00000001 (1)
channels: ARRAY(1)
channels: struct smbXsrv_channel_global0
server_id: struct server_id
pid : 0x0000000000006d1b (27931)
task_id : 0x00000000 (0)
vnn : 0xffffffff (4294967295)
unique_id : 0x186f91593000f4b8 (1760785791568639160)
local_address : 'ipv4:10.0.0.1:445'
remote_address : 'ipv4:10.0.0.90:56660'
remote_name : '10.0.0.90'
auth_session_info_seqnum : 0x00000001 (1)
connection : *
status : NT_STATUS_OK
idle_time : Thu Mar 19 18:07:34 2020 CET
nonce_high_random : 0x88195c3aa5fe5e25 (-8639773003170816475)
nonce_high_max : 0x0000000000ffffff (16777215)
nonce_high : 0x0000000000000000 (0)
nonce_low : 0x0000000000000000 (0)
gensec : *
compat : *
tcon_table : *
preauth : NULL
encryption_desired : 0x00 (0)
[2020/03/19 18:07:33.658165, 10, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/smb2_server.c:2680(smbd_smb2_request_done_ex)
smbd_smb2_request_done_ex: idx[1] status[NT_STATUS_OK] body[8] dyn[yes:29] at ../source3/smbd/smb2_sesssetup.c:171
[2020/03/19 18:07:33.658182, 10, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/smb2_server.c:906(smb2_set_operation_credit)
smb2_set_operation_credit: requested 33, charge 1, granted 33, current possible/max 512/512, total granted/max/low/range 33/8192/4/33
[2020/03/19 18:07:33.683865, 10, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/smb2_server.c:1061(smbd_server_connection_terminate_ex)
smbd_server_connection_terminate_ex: reason[NT_STATUS_CONNECTION_RESET] at ../source3/smbd/smb2_server.c:3591
[2020/03/19 18:07:33.683908, 4, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/sec_ctx.c:321(set_sec_ctx_internal)
setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0
[2020/03/19 18:07:33.683923, 5, pid=27931, effective(0, 0), real(0, 0)] ../libcli/security/security_token.c:53(security_token_debug)
Security token: (NULL)
[2020/03/19 18:07:33.683937, 5, pid=27931, effective(0, 0), real(0, 0)] ../source3/auth/token_util.c:639(debug_unix_user_token)
UNIX token of user 0
Primary group is 0 and contains 0 supplementary groups
[2020/03/19 18:07:33.683963, 5, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/uid.c:425(smbd_change_to_root_user)
change_to_root_user: now uid=(0,0) gid=(0,0)
[2020/03/19 18:07:33.683980, 4, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/sec_ctx.c:321(set_sec_ctx_internal)
setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0
[2020/03/19 18:07:33.683993, 5, pid=27931, effective(0, 0), real(0, 0)] ../libcli/security/security_token.c:53(security_token_debug)
Security token: (NULL)
[2020/03/19 18:07:33.684010, 5, pid=27931, effective(0, 0), real(0, 0)] ../source3/auth/token_util.c:639(debug_unix_user_token)
UNIX token of user 0
Primary group is 0 and contains 0 supplementary groups
[2020/03/19 18:07:33.684033, 5, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/uid.c:425(smbd_change_to_root_user)
change_to_root_user: now uid=(0,0) gid=(0,0)
[2020/03/19 18:07:33.684048, 4, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/sec_ctx.c:321(set_sec_ctx_internal)
setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0
[2020/03/19 18:07:33.684060, 5, pid=27931, effective(0, 0), real(0, 0)] ../libcli/security/security_token.c:53(security_token_debug)
Security token: (NULL)
[2020/03/19 18:07:33.684072, 5, pid=27931, effective(0, 0), real(0, 0)] ../source3/auth/token_util.c:639(debug_unix_user_token)
UNIX token of user 0
Primary group is 0 and contains 0 supplementary groups
[2020/03/19 18:07:33.684094, 5, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/uid.c:425(smbd_change_to_root_user)
change_to_root_user: now uid=(0,0) gid=(0,0)
[2020/03/19 18:07:33.684132, 5, pid=27931, effective(0, 0), real(0, 0)] ../lib/dbwrap/dbwrap.c:178(dbwrap_check_lock_order)
check lock order 1 for /var/run/samba/smbXsrv_session_global.tdb
[2020/03/19 18:07:33.684148, 10, pid=27931, effective(0, 0), real(0, 0)] ../lib/dbwrap/dbwrap.c:133(debug_lock_order)
lock order: 1:/var/run/samba/smbXsrv_session_global.tdb 2:<none> 3:<none>
[2020/03/19 18:07:33.684164, 10, pid=27931, effective(0, 0), real(0, 0)] ../lib/dbwrap/dbwrap_tdb.c:59(db_tdb_log_key)
Locking key B266FEC4
[2020/03/19 18:07:33.684183, 10, pid=27931, effective(0, 0), real(0, 0)] ../lib/dbwrap/dbwrap_tdb.c:143(db_tdb_fetch_locked_internal)
Allocated locked data 0x0x7f114a823370
[2020/03/19 18:07:33.684210, 10, pid=27931, effective(0, 0), real(0, 0)] ../lib/dbwrap/dbwrap_tdb.c:59(db_tdb_log_key)
Unlocking key B266FEC4
[2020/03/19 18:07:33.684225, 5, pid=27931, effective(0, 0), real(0, 0)] ../lib/dbwrap/dbwrap.c:146(dbwrap_lock_order_state_destructor)
release lock order 1 for /var/run/samba/smbXsrv_session_global.tdb
[2020/03/19 18:07:33.684237, 10, pid=27931, effective(0, 0), real(0, 0)] ../lib/dbwrap/dbwrap.c:133(debug_lock_order)
lock order: 1:<none> 2:<none> 3:<none>
[2020/03/19 18:07:33.684261, 4, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/sec_ctx.c:321(set_sec_ctx_internal)
setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0
[2020/03/19 18:07:33.684274, 5, pid=27931, effective(0, 0), real(0, 0)] ../libcli/security/security_token.c:53(security_token_debug)
Security token: (NULL)
[2020/03/19 18:07:33.684286, 5, pid=27931, effective(0, 0), real(0, 0)] ../source3/auth/token_util.c:639(debug_unix_user_token)
UNIX token of user 0
Primary group is 0 and contains 0 supplementary groups
[2020/03/19 18:07:33.684308, 5, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/uid.c:425(smbd_change_to_root_user)
change_to_root_user: now uid=(0,0) gid=(0,0)
[2020/03/19 18:07:33.684424, 3, pid=27931, effective(0, 0), real(0, 0)] ../source3/smbd/server_exit.c:252(exit_server_common)
Server exit (NT_STATUS_CONNECTION_RESET)
Thanks
--
Lorenzo Milesi - lorenzo.milesi at yetopen.it
YetOpen S.r.l. - https://www.yetopen.it/
Via Salerno 18 - 23900 Lecco - ITALY -
Tel +39 0341 220 205 - Fax +39 178 6070 222
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